Arrangement for classifying of liquid suspensions

ABSTRACT

Liquid suspensions are classified by means of a substantially horizontal vibrating screen, whereby the suspension is supplied to the bottom part of the screen. The screened material passes through the screen, taken along by the raising stream of the suspension and is removed from the top part of the screen. The part of material which cannot pass the screen remains in the bottom part, wherefrom it is drained. The screening effect is thus not reduced by solid material settling on the screen surface.

United States Patent Inventors Appl. No. Filed Patented AssigneePriority Ladislav Kristek;

Antonin Svizela; Ivo Hampl, all of Prerov, Czechoslovakia Feb. 26, 1969Jan. 11, 1972 Prerovske Strojirny, narodni potnik Prerov, CzechoslovakiaFeb. 28, 1968 Czechoslovakia ARRANGEMENT FOR CLASSIFYING OF LIQUIDSUSPENSIONS 4 Claims, 2 Drawing Figs.

US. Cl 209/262,

209/269, 209/310, 209/346, 209/368 Int. Cl B07b 1/28 Field of Search209/25 1 [56] References Cited UNITED STATES PATENTS 2,570,035 10/195!Laughlin 209/269 X 3,073,079 1/1963 Balz 209/260 X 3,325,007 6/l967Erlenstadt et al 209/368 X 3,507,387 4/l970 Alldred et al. 209/2 634,929[0/1899 White 209/357 Primary Examiner-Frank W. Lutter AssistantExaminerWilliam Cuchlinski, Jr. Attorneys-Richard Low and MurraySchaffer ABSTRACT: Liquid suspensions are classified by means of asubstantially horizontal vibrating screen, whereby the suspension issupplied to the bottom part of the screen. The screened material passesthrough the screen, taken along by the raising stream of the suspensionand is removed from the top part of thescreen. The part of materialwhich cannot pass the screen remains in the bottom part, wherefrom it isdrained. The

screening effect is thus not reduced by solid material settling i on thescreen surface.

ARRANGEMENT FOR CLASSIFYING F LIQUID SUSPENSKONS This invention relatesto vibrating screens for classifying liquid suspensions, as for instanceceramic slip or different chemical material.

Vibrating screens of different design are actually for this purpose,most of which are vibrating along a circular track in the plane of thescreen, or in planes perpendicular or inclined to said plane. Thegravitation effect is used for the passage of the classified materialthrough the screen. A drawback of similar screens is their decreasingefficiency and output of the screen surface due to increased collectingof material which did not pass through the screen on the screen surface,requiring a frequent interruption of the operation in order to clean thescreen surface with the danger of damaging the fine screen mesh whenusing mechanical means for this cleaning.

It is an object of this invention to provide a vibrating screen forclassifying of liquid suspensions, where the remaining material, whichcannot pass the screen, would not settle on the screen surface.

Another object of this invention is to increase the efficiency ofclassifying.

Still another object of this invention is to eliminate the difficultcleaning of actually used screen surfaces.

Bearing these and other objects of this invention in mind we provide asubstantially horizontal vibrating screen, where the liquid suspensionto be classified is supplied to the bottom surface of the screen, thescreened material being taken along by the raising stream, passingthrough the screen, the residual material remaining below the screen.The corresponding arrangement comprises a vessel with a substantiallyhorizontal screen on the top, with an inlet for the supply of the liquidsuspension to be classified to said vessel below the screen surface; theliquid flowing through the vessel as a result of the pressuredifferential created above and below the screen, causing passage of partof the screened material through the screen.

An exemplary embodiment of the object of this invention is schematicallyshown in the accompanying drawing, where FIG. 1 is a sectional elevationof an arrangement for classifying according to this invention,

FIG. 2 a sectional elevation with the plane of section perpendicular tothat of FIG. 1.

With reference to FIG. 1, the screening vessel 1, resting on a frame 10,is provided with a supply funnel 2 terminating laterally into vessel 1andextending above the top of the vessel 1. A horizontal screen 3 isfixed to the top of the vessel l by means of a frame 4 with an extensionon the top and with a discharge branch 5 at the side opposite to thesupply funnel 2. A generator 6 of vibrations of commonly known design isfixed in the lower part of the vessel 1, which transmits by way of theexciter 7 of vibrations the vibrations to the screen 3. The exciter 7can be advantageously arranged as described our copending applicationSer. No. 802,567, filed on even date herewith consisting of an auxiliaryframe 12 engaging and encompassing part of the area of the screen,connected with the generator 6 of vibrations by means of a yoke 13. Theauxiliary frame 12 either only rests against the screen 3 or the screen3 is clamped firmly between two corresponding auxiliary frames 12. Aremovable cover 8 is arranged in the front wall of the vessel 1. Bolts 9are fixed to both opposite lateral walls of the vessel 1, said bolts 9supported pivotably in the frame 10. The right bolt 9 is provided withstop means 11 and a disk 11a fixed to the bolt 9. The stop means 11 ismounted on the leg and is adapted to selectively engage the disk lla atdifferent points so as to enable the vessel I to be adjustably fixedeither in its horizontal, inclined or vertical position as seen in FIG.1 in full in dotted lines. The horizontal position serves for the properscreening operation, the inclined and also one vertical position servesfor emptying of the water prior to removal of the material whichremained in the vessel 1. The vertical position of the vessel I isindicated in FIG. I by broken lines. A vertical position opposite tothat shown in FIG. I can serve for emptying of the contentpf the vesselI.

The material to be classified IS supplied from the top into the supplyfunnel 2 enters through the lateral wall into the vessel 1 and as thesurface of the material in the funnel 2 is maintained higher than thescreen 3, a pressurized stream is generated which passes from belowthrough the screen 3, taking along the material, which can pass throughthe mesh of the screen. The screened material forms above the screen 3 alevel about 2 inches of height and is subsequently discharged throughthe discharge branch 5 into a container not shown. The rest which cannotpass through the screen 3 settles at the bottom of the vessel 1 and doesnot collect on the screen 3 and therefore also cannot reduce theefficiency of screening. This settled residue is periodically removedfrom the vessel 1. That can be done either after stoppage of the supplyof the material to be screened into the funnel 2 and after release ofthe stop means 11 by first inclining the vessel 1 into an inclined orvertical position, whereby the water contained in the vessel 1 isallowed to be drained via the screen 3. The material settled in thevessel is thereafter discharged by turning the vessel i into a verticalposition opposite to that shown in FIG. 1 whereby the settled materialpasses through the funnel 2 into a not shown container. Anotherpossibility is the discharge through the removed cover 8.

By application of this invention higher specific outputs of the screensurface and reduction of time required for emptying of differentdressing devices as mills or floating devices is achieved and thus alsoa higher grade of economical efficiency of the technologicalarrangement.

We claim:

1. Apparatus for separating particles from a liquid suspensioncomprising a vessel having a bottom and sidewalls, an inlet located nearits bottom and an outlet located near its top, a screen, said screenconforming to and fixed continuously about its entire periphery aroundthe walls of said vessel between said inlet and outlet opening, saidscreen dividing said vessel into an upper and lower compartment havingfluid communication therebetween only through said screen, said screen,creating a barrier to the flow of said suspension between said lower andupper compartment means for delivering said fluid suspension to saidinlet opening and for causing said suspension to flow in a risingcurrent under pressure through said vessel, and means attached to saidscreen for directly vibrating said screen whereby particles smaller thansaid screen are caused to be carried by said flow to said outlet andparticles larger than said screen are caused to fall to the bottom ofsaid vessel.

2. Apparatus according to claim 1 including port means for removing theaccumulated particles from said lower compartment.

3. The apparatus according to claim 1 wherein said means for feedingsaid fluid suspension comprises an L-shaped funnel opening above saidscreen and having a horizontal portion communicating with said inletbelow said screen.

4. Wherein the apparatus according to claim I wherein said vessel ispivotally mounted on a supporting frame and is provided with means foradjustably tilting said vessel.

1. Apparatus for separating particles from a liquid suspensioncomprising a vessel having a bottom and sidewalls, an inlet located nearits bottom and an outlet located near its top, a screen, said screenconforming to and fixed continuously about its entire periphery aroundthe walls of said vessel between said inlet and outlet opening, saidscreen dividing said vessel into an upper and lower compartment havingfluid communication therebetween only through said screen, said screen,creating a barrier to the flow of said suspension between said lower andupper compartment means for delivering said fluid suspension to saidinlet opening and for causing said suspension to flow in a risingcurrent under pressure through said vessel, and means attached to saidscreen for directly vibrating said screen whereby particLes smaller thansaid screen are caused to be carried by said flow to said outlet andparticles larger than said screen are caused to fall to the bottom ofsaid vessel.
 2. Apparatus according to claim 1 including port means forremoving the accumulated particles from said lower compartment.
 3. Theapparatus according to claim 1 wherein said means for feeding said fluidsuspension comprises an L-shaped funnel opening above said screen andhaving a horizontal portion communicating with said inlet below saidscreen.
 4. Wherein the apparatus according to claim 1 wherein saidvessel is pivotally mounted on a supporting frame and is provided withmeans for adjustably tilting said vessel.